The latest version could be used on my R720 server, the main differents between R710 and R720 is RAID controller. R710 is Prec6/i, and R720 is H710. Is that mean DSS v7 does not support Prec 6/i early version(firmware 6.3.3)?
What is your boot media? Are you installing on a single SSD or maybe a SATA DOM? Does the system boot with a Flash Stick? With the latest release that was provided to you it does have the latest LSI drivers that Dell OEMs.